Abstract This study examined longitudinal changes in second language (L2) interlocutors’ mutual comprehensibility ratings (perceived ease of understanding speech), targeting comprehensibility as a dynamic, time-varying, interaction-centered construct. In a repeated-measures, within-participants design, 20 pairs of L2 English university students from different language backgrounds engaged in three collaborative and interactive tasks over 17 minutes, rating their partner’s comprehensibility at 2–3 minute intervals using 100-millimeter scales (seven ratings per interlocutor). Mutual comprehensibility ratings followed a U-shaped function over time, with comprehensibility (initially perceived to be high) being affected by task complexity but then reaching high levels by the end of the interaction. The interlocutors’ ratings also became more similar to each other early on and remained aligned throughout the interaction. These findings demonstrate the dynamic nature of comprehensibility between L2 interlocutors and suggest the need for L2 comprehensibility research to account for the effects of interaction, task, and time on comprehensibility measurements.

This study examined whether social bias manipulation can influence how naïve multiage listeners evaluate second language (L2) speech. Sixty native English-speaking listeners (Montreal residents) rated audio recordings of 40 Quebec French speakers of L2 English for five dimensions of oral performance (accentedness, comprehensibility, segmental accuracy, intonation, flow) using 1,000-point continuous scales. Immediately before rating, 20 listeners heard critical comments about Quebec French speakers’ English language skills, while 20 heard positive comments. Twenty listeners (baseline group) received no manipulation. Compared to baseline listeners, positively oriented listeners (younger and older) rated four of five dimensions more favorably. However, listeners’ behavior diverged under negative bias. Compared to age-matched baseline listeners, younger listeners upgraded speakers while older listeners downgraded speakers for all targeted measures. Findings cast doubt on the relative stability of L2 speech ratings and point to the importance of social context and generational differences in untrained rater assessments of L2 speaking performance.

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This study examined whether a negative social bias can influence how teachers evaluate second language (L2) speech. Twenty-eight teachers of L2 German from Western Canada – 14 native speakers (NSs) and 14 proficient non-native speakers (NNSs) – rated recordings of 24 adult L2 learners of German across five speech dimensions (accentedness, comprehensibility, vowel/consonant accuracy, intonation, flow) using 1,000-point scales. Immediately before rating, half of NS and NNS teachers heard critical comments about undergraduate German students’ language skills, while the other half heard no biasing comments. Under negative bias, while the NNS teachers provided favorable evaluations across all five measures, NS teachers followed suit for only intonation and flow, downgrading L2 speakers’ accentedness, comprehensibility, and vowel/consonant accuracy. Findings call into question the relative stability of L2 speech ratings and highlight the importance of social context and teacher status as native versus non-native speakers of the target language in assessments of L2 speaking performance.

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